A tour of grp:04 - GRP unary call unary call

In the last one , We tried proto  Serialization function of , And try to serialize across languages . And in this article , We will taste   Try to implement a simple gRPC  Unary calls (unary call), adopt client call server Create a Laptop Yes   like , And stored in server The memory of the , And also try to call across languages .

go unary call

1.  Write a laptop_service.proto, Give Way proto Help us generate stub

​ The proto  It consists of three parts

• CreateLaptopRequest ( Create request )

• CreateLaptopResponse ( Create a response )

• LaptopService(laptop Related services ) 
  ·
   CreateLaptop ( Including request parameters and return parameters )

2.  function  make gen  Generate the service laptop_service.pb.go

3.  Because the focus of this time is grpc Not database storage , Here we use memory to store data , Create a new one service Package write a laptop_store.go  Decoupling .

​4.  To write  laptop  Service laptop_server.go  As the implementation of the server

​5.  To write laptop_server_test.go  As server  The test class

​ Let's use this unit test , Test it server  Whether the creation method of the end works normally . You can see

Yes id、 nothing id、 illegal id、 repeat id All the conditions meet the test expectations

​ The test results run normally .

6.  To write laptop_client_test.go  As client The test class

​ Run the test , Successfully started server  And pass  client  The call of creates a  laptop

​7.  Okay , Next we're going to work on  client  and  server  Each write a startup class

a. main/client/main.go  As client  The start of class

​b. main/server/main.go  As client  The start of class

​c.  modify  Makefile  increase  client  and  server  Quick start of

​8. Running server 、 Then run the client , modify clien establish laptop Of id Content , Perform the following tests

• client  carry id 【 success 】

• client  Do not carry id 【 success 】

• client  Illegal carrying id 【 Failure 】

• client  Carry repetition id 【 Failure 】

​ The operation results are in line with expectations .

Java unary call

1.  Torture ⻉ Before that go Written in the project laptop_service.proto  And generate code

2.  Same as  go  Because the database is not used here ( Focus on grpc) So write a LaptopStore  Interface   And a InMemoryLaptopStore Implementation class , For decoupling .

a. LaptopStore interface

​b. InMemoryLaptopStore  Implementation class

​3.  And then server Write under the package LaptopServer Service

​4.  stay  service  Write under the package LaptopClient  As  client  The start of class

​5.  stay  service  Write under the package LaptopServer  As  server  The start of class

​6.  Also write a unit test class for the server LaptopServerTest

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​ The test results are in line with expectations

Okay , Next we'll have the same golang Same project , Running server 、 Then run the client , modify clien establish  laptop  Of  id  Content ,  Perform the following tests :client  carry id 【 success 】、client  Do not carry id 【 success 】、client  Illegal carrying id 【 Failure 】client  carry   Band repetition id 【 Failure 】

The test results are the same as above , There will be no display here .

Cross language  unary call  test

So let's start  Java  Of  Server  Run again  golang  Of client, Do the same test as above :client  carry id 【 success 】、client  Do not carry id 【 success 】、client  Illegal carrying id 【 Failure 】client  Carry repetition id 【 Failure 】

​ The test results are in line with expectations .

We might as well test it in reverse , Use  golang  Of  server  and  Java  Of  client

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The test results are also in line with expectations , No problem . In this paper , We did gRPC Medium unary call  And made a preliminary attempt gRPC Ability to call across languages .

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